As usual, Windows Secrets is right on top of the current security problem with Internet Explorer. These security-related articles from the best source of Windows information on the Web are required reading. They will refer you to the most relevant source material and usually contain the practical advice for dealing with threats.
Not surprisingly, the most serious threat is to computers still equipped with the now-ancient version 6 of IE. I cannot emphasize enough the importance of abandoning use of IE6 in favor of any contemporary browser, including IE8.